with \(\Delta _{0,i}\)  being the gap value at \(T = 0\) , which approximates the BCS temperature dependence of \(\Delta _i/\Delta _{0,i}\)  well. To account for the experimental data quantitatively, various two-gap scenario based on the \(\alpha \) -model [1]}, [2]} are applied: (a) a fully gapped \(s + s\)  state, (b) a model with a full gap on one and with nodal lines on the second Fermi sheet (denoted by \(s+\text{line}\) ), and (c) a full gap on one and point nodes on the second sheet (\(s+\text{point}\) ). For the full gap, line nodes, and point nodes we use \(g(\phi ,\theta )\)  = 1, \(g(\phi ,\theta )\)  = \(|\cos (2\phi )|\) , and \(g(\phi ,\theta )\)  = \(|\sin \theta |\) , respectively.
The two-gap model is incorporated by using a weighted sum of two gap values as [3]}, [4]}, [5]},
\(\frac{\sigma _{sc}(T)}{\sigma _{sc}(0)} = w_1 \delta \sigma _{sc}(T,\Delta _{0,1}) + w_2 \delta \sigma _{sc}(T,\Delta _{0,2})\\\) 
